/Engine/Source/Runtime/Slate/Public/Framework/Application/MenuStack.h
Dismisses the menu stack including InFromMenu and all its child menus Dismisses in reverse order (children first)
void DismissFrom ( const [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [IMenu](API\Runtime\Slate\Framework\Application\IMenu) > & InFromMenu )